Pos Interface Features Supported By The S9300; Configuring Pos Interfaces; Establishing The Configuration Task - Huawei Quidway S9300 Configuration Manual - Wan Access

Quidway S9300 Terabit Routing Switch
Configuration Guide - WAN Access
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1.2 POS Interface Features Supported by the S9300

Packet over SONET/SDH (POS) maps packets of variable lengths into the payload of SONET/
SDH signals. POS transmits packets at the physical layer of SONET/SDH, which provides a
high speed, reliable, and point-to-point data connection.
The S9300 supports the configurations of link-layer protocols, clock mode, overhead byte, and
CRC check on POS interfaces.

1.3 Configuring POS Interfaces

You can configure the link layer protocol, clock mode, overhead byte, frame format, and CRC
for POS interfaces.

1.3.1 Establishing the Configuration Task

Before configuring POS interfaces, familiarize yourself with the applicable environment,
complete the pre-configuration tasks, and obtain the required data. This can help you complete
the configuration task quickly and accurately.
Applicable Environment
Before using a SONET/SDH optical interface to bear packet data, you need to configure
parameters for the POS interface.
Pre-configuration Tasks
Before configuring a POS interface, complete the following task:
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Issue 02 (2011-07-15)
J0, the regeneration section trace byte is contained in RSOH. This byte is used to transmit
the Section Access Point Identifiers (SAPIs) repeatedly to check the connection between
the receiver and the transmitter. The byte can be any character in the networks of a carrier,
whereas the J0 byte of the receiver and the transmitter must match each other at the border
of networks between two carriers. With the JO byte, a carrier can locate and rectify faults
in advance to speed up the network recovery.
Path overhead
SOH monitors section layers, whereas POH monitors path layers. POH is classified into
lower-order path overhead and higher-order path overhead.
The higher-order path overhead monitors the paths at VC-4 and VC-3 levels.
J1, the higher-order VC-N path trace byte, is contained in the higher-order path overhead.
Similar to j0, J1 is used to transmit SAPIs repeatedly to check the connection between the
receiver and the transmitter. J1 bytes of the receiver and transmitter must match each other.
C2, the path signal label byte, is contained in higher-order path overhead. C2 is used to
specify the multiplexing structure and the attributes of the information payload in a VC
frame, including whether the path is loaded with services, service types, and the mapping
mode. C2 bytes of the receiver and transmitter must match each other.
Powering on the switch and starting it normally
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1 POS Interface Configuration
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